// Basic tests for the machineGroupControl commands registry.
// Run with:  node --test test/basic/commands.basic.test.js

'use strict';

const test = require('node:test');
const assert = require('node:assert/strict');

const { createRegistry } = require('generalFunctions');
const commands = require('../../src/commands');

// --- helpers ---------------------------------------------------------------

function makeLogger() {
  const calls = { warn: [], error: [], info: [], debug: [] };
  return {
    calls,
    warn: (m) => calls.warn.push(String(m)),
    error: (m) => calls.error.push(String(m)),
    info: (m) => calls.info.push(String(m)),
    debug: (m) => calls.debug.push(String(m)),
  };
}

function makeSource({ name = 'mgc-1', handleInputResult = undefined } = {}) {
  const calls = {
    setMode: [],
    setScaling: [],
    handleInput: [],
    registerChild: [],
  };
  const source = {
    logger: makeLogger(),
    config: { general: { name } },
    setMode: (m) => calls.setMode.push(m),
    setScaling: (s) => calls.setScaling.push(s),
    handleInput: async (src, demand) => {
      calls.handleInput.push({ src, demand });
      if (handleInputResult instanceof Error) throw handleInputResult;
      return handleInputResult;
    },
    childRegistrationUtils: {
      registerChild: (childSource, position) =>
        calls.registerChild.push({ childSource, position }),
    },
  };
  return { source, calls };
}

function makeCtx({ child = null, logger = makeLogger(), sendSpy = null } = {}) {
  return {
    logger,
    RED: { nodes: { getNode: (id) => (child && child.id === id ? child : undefined) } },
    node: {},
    send: sendSpy || (() => {}),
  };
}

function makeRegistry(logger) {
  return createRegistry(commands, { logger });
}

// --- tests -----------------------------------------------------------------

test('canonical topics dispatch to their handlers', async () => {
  const { source, calls } = makeSource();
  const reg = makeRegistry(makeLogger());

  await reg.dispatch({ topic: 'set.mode', payload: 'prioritycontrol' }, source, makeCtx());
  assert.deepEqual(calls.setMode, ['prioritycontrol']);

  await reg.dispatch({ topic: 'set.scaling', payload: 'normalized' }, source, makeCtx());
  assert.deepEqual(calls.setScaling, ['normalized']);

  await reg.dispatch({ topic: 'set.demand', payload: '12.5' }, source, makeCtx());
  assert.equal(calls.handleInput.length, 1);
  assert.deepEqual(calls.handleInput[0], { src: 'parent', demand: 12.5 });
});

test('child.register canonical resolves child via RED.nodes.getNode', async () => {
  const { source, calls } = makeSource();
  const child = { id: 'child-1', source: { tag: 'child-domain' } };
  const reg = makeRegistry(makeLogger());

  await reg.dispatch(
    { topic: 'child.register', payload: 'child-1', positionVsParent: 'upstream' },
    source,
    makeCtx({ child })
  );
  assert.equal(calls.registerChild.length, 1);
  assert.equal(calls.registerChild[0].childSource, child.source);
  assert.equal(calls.registerChild[0].position, 'upstream');
});

test('aliases dispatch to the same handler and log a one-time deprecation', async () => {
  const { source, calls } = makeSource();
  const ctxLogger = makeLogger();
  const reg = makeRegistry(ctxLogger);

  await reg.dispatch({ topic: 'setMode', payload: 'prioritycontrol' }, source, makeCtx({ logger: ctxLogger }));
  await reg.dispatch({ topic: 'setMode', payload: 'optimalcontrol' }, source, makeCtx({ logger: ctxLogger }));
  assert.deepEqual(calls.setMode, ['prioritycontrol', 'optimalcontrol']);
  let warns = ctxLogger.calls.warn.filter((m) => m.includes("'setMode' is deprecated"));
  assert.equal(warns.length, 1, 'setMode deprecation warning should log exactly once');

  await reg.dispatch({ topic: 'setScaling', payload: 'absolute' }, source, makeCtx({ logger: ctxLogger }));
  warns = ctxLogger.calls.warn.filter((m) => m.includes("'setScaling' is deprecated"));
  assert.equal(warns.length, 1);
  assert.deepEqual(calls.setScaling, ['absolute']);

  await reg.dispatch({ topic: 'Qd', payload: 5 }, source, makeCtx({ logger: ctxLogger }));
  warns = ctxLogger.calls.warn.filter((m) => m.includes("'Qd' is deprecated"));
  assert.equal(warns.length, 1);
  assert.equal(calls.handleInput.length, 1);

  const child = { id: 'child-x', source: { tag: 'child-domain' } };
  await reg.dispatch(
    { topic: 'registerChild', payload: 'child-x', positionVsParent: 'atEquipment' },
    source,
    makeCtx({ child, logger: ctxLogger })
  );
  warns = ctxLogger.calls.warn.filter((m) => m.includes("'registerChild' is deprecated"));
  assert.equal(warns.length, 1);
  assert.equal(calls.registerChild.length, 1);
});

test('set.demand with non-numeric payload logs error and does not call handleInput', async () => {
  const { source, calls } = makeSource();
  const ctxLogger = makeLogger();
  const reg = makeRegistry(makeLogger());

  await reg.dispatch({ topic: 'set.demand', payload: 'oops' }, source, makeCtx({ logger: ctxLogger }));
  assert.equal(calls.handleInput.length, 0);
  assert.ok(
    ctxLogger.calls.error.some((m) => m.includes('set.demand') && m.includes('oops')),
    `expected error about invalid Qd, got: ${JSON.stringify(ctxLogger.calls.error)}`
  );
});

test('set.demand on success calls ctx.send with reply { topic: config.general.name, payload: "done" }', async () => {
  const { source, calls } = makeSource({ name: 'mgc-A' });
  const sent = [];
  const ctx = makeCtx({ sendSpy: (m) => sent.push(m) });
  const reg = makeRegistry(makeLogger());

  await reg.dispatch({ topic: 'set.demand', payload: 7.5 }, source, ctx);

  assert.equal(calls.handleInput.length, 1);
  assert.deepEqual(calls.handleInput[0], { src: 'parent', demand: 7.5 });
  assert.equal(sent.length, 1);
  assert.equal(sent[0].topic, 'mgc-A');
  assert.equal(sent[0].payload, 'done');
});

test('child.register with unknown child id logs warn and does not throw', async () => {
  const { source, calls } = makeSource();
  const ctxLogger = makeLogger();
  const reg = makeRegistry(makeLogger());

  await assert.doesNotReject(() =>
    reg.dispatch(
      { topic: 'child.register', payload: 'missing-id', positionVsParent: 'atEquipment' },
      source,
      makeCtx({ logger: ctxLogger })
    )
  );
  assert.equal(calls.registerChild.length, 0);
  assert.ok(
    ctxLogger.calls.warn.some((m) => m.includes('registerChild') && m.includes('missing-id')),
    `expected warn about missing child, got: ${JSON.stringify(ctxLogger.calls.warn)}`
  );
});